Question

1) Question with methods use scanner:

1) Create one method that will add four numbers (return method or regular public static void )
2) Create another method that will subtract four numbers (return method or regular public static void )
3) Create another method that will multiplay four numbers (return method or regular public static void )
4) Create another method that will divide four numbers (return method or regular public static void )
5) Create another method that will find average of four numbers (return method or regular public static void )
6) In main method (Two parts):
1) Call four System prompt to enter numbers and four variables that will relate to scanner (they should be consistent with
variables declared in above methods).
2) Display results even with system.out.print assigned in main method or in your methods above?

Answer 1

Refer to code snippet below. Ask any doubts or clarifications in comments section.

import java.util.Scanner;

public class Answer {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                System.out.println("Enter first number: "); //get first number
                int a = sc.nextInt();
                System.out.println("Enter second number: "); //get second
                int b = sc.nextInt();
                System.out.println("Enter third number: "); //get third
                int c = sc.nextInt();
                System.out.println("Enter fourth number: ");//get fourth
                int d = sc.nextInt();
                addNums(a, b, c, d); //call addNums method
                subtractNums(a, b, c, d);//call subtractNums method
                multiplyNums(a, b, c, d); //call multiplyNums method
                divideNums(a, b, c, d); //call divideNums method
                averageNums(a, b, c, d);// call averageNums method
        }
        public static void addNums(int a, int b, int c, int d)
        {
                int result = a+b+c+d; //add
                System.out.println("Sum of 4 numbers is : "+result); //print value
        }
        public static void subtractNums(int a, int b, int c, int d)
        {
                int result = a-b-c-d; //subtract
                System.out.println("Difference of 4 numbers is : "+result);//print value
        }
        public static void multiplyNums(int a, int b, int c, int d)
        {
                int result = a*b*c*d; //multiply
                System.out.println("Product of 4 numbers is : "+result);//display 
        }
        public static void divideNums(int a, int b, int c, int d)
        {
                double result = (double) a/b/c/d; //divide
                System.out.printf("Division of 4 numbers is : %.2f\n", result); //display
        }
        public static void averageNums(int a, int b, int c, int d)
        {
                double result = (a+b+c+d)/4; //find average
                System.out.println("Average of 4 numbers is : "+result); //display
        }
}

Output:

Refer to output above. Thanks.